Moravec's Paradox: Hard Tasks Easy, Easy Tasks Hard

Moravec's paradox holds that the things that impress us as humans, like arithmetic or chess, are precisely the things computers find easy, while the seemingly trivial things almost any human or child can do, like physically manipulating objects in the real world ('at chess'), are extraordinarily difficult for machines, so menial physical jobs like plumbing are harder to automate than high-cognition jobs like oncology.